Team:KAIT Japan/Protocol

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Human Practice


Protocol

1:miniprep

・We took plasmid out of Escherichia coli which have a gene of IL-10 α and IL-10 β and STAT3 in miniprep to use it by a following experiment (the Escherichia coli which I really used in an experiment of 2013).
DNA of HlyA and the GFP are IGEM 2014 kit plate1 21G and IGEM 2014 kit plate 13L, so we didn't miniplep

1) We cultured bacterial strain with the LB medium which I added ampicillin to so that density becomes 100ug/ml overnight.(We made a nutrient medium of around 5 ml in 50 ml falcons)(Against 5 ml of nutrient mediums, Amp used 5ul)

2) Aliquot 1ml culture into a 1.5 ml microcentrifuge tube,and Made it spin at 10000rpm (4℃) for 1 min to harvest the bacteria.

3) Removed supernatant and performed 2)operation again, Removed supernatant .

4) Resuspended bacterial pellet by complete vortexing in 100ul SolutionⅠ{D-glucose:9g(50mM),1M Tris-HCl(pH 8.0):25ml(25mM),0.5M EDTA:20ml(10mM),H2O:955ml /1L}.

5) Inverted bacterial pellet by complete fall mixtureing in 200ul SolutionⅡ{NaOH:8g,SDS:10g[1%(w/v)],H2O:960ml /1L},and confirmed that it became transparent.

6) Cooled for three minutes in ice.

7) Inverted bacterial pellet by complete fall mixtureing in 150ul SolutionⅢ{CH3COOH:294.5g(3M),CH3COOH:120ml(2M),H2O:diluting in measuring cylinder to 1L total},and confirmed that it became Cloudiness.

8) Cooled for 3 minutes in ice.

9) Harvested the DNA by spinning at 10000rpm (4℃) for 10 min.

10) Gathered only supernatant and moved it in a new microcentrifuge tube.

11) Added 0.8ul Rnase(10mg/ml) and incubate the solution(37℃,1min)

12) Added 200ul phenol:chloroform(1:1) and inverted

13) Harvested by spinning at 10000rpm (4℃) for 5 min.

14) Removed only supernatant and moved it in a new microcentrifuge tube, after that tapped in 200ul chloroform.

15) Harvested by spinning at 10000rpm (4℃) for 1 min.

16) Moved its supernatant to a new microcentrifuge tube and add 15ul 3M CH3COONa.(Don't gather underlayer)(The ratio of the 3M sodium acetate and supernatant is made to be 10:1)

17) Added 400ul 100%CH3CH2OH and made it stirred well.

18) Harvested by spinning at 10000rpm (4℃) for 20 min.

19) Removed only supernatant and added 400ul 70%CH3CH2OH(pour a liquid from the other side for white thing not to drain a white.[white thing is plasmid])

20) Harvested by spinning at 10000rpm (4℃) for 20 min.

21) Removed only supernatant and opened the cover of the tube for 10min to dry CH3CH2OH.

22) Added 50ul TE to dissolve DNA

23) We stored low temperature





2:PCR

・We performed PCR to confirm whether DNA which we need.

1)We diluted the primer.(D2W:primer=4:1)

2)Made PCR preparation liquid {buffer×10:2.5ul,dNTP:2ul,PrimerF:1ul,PrimerR:1ul,Taq Polumerase:0.1ul,D2W:17.39ul /1 microcentrifuge tube(0.2ml)}

3)Added sample(there are Plasmid made with miniprep)to the microcentrifuge tube and do PCR(The PCR conditions are as follows).

4)We did Electrophoresis to confirm Objective band.





3:Restriction enzyme processing

・We did restriction enzyme processing to plasmid to incorporate inserts in a plasmid vector.

Figure②:Used Restriction enzyme
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HlyA・・・We removed the stop codon
F chain ・・・This has EcoR1 recognition sequence.We added CG and A to this to prevent flame out.
・5'-CGGAATTCATTAGCCTATGGAAGTCAGGG-3'
((Tm before adding a restriction enzyme site =60℃
((GC before adding a restriction enzyme site =50.0%

R chain ・・・This has HindⅢ recognition sequence.We added CCC to this.
・5'-CCCAAGCTTTGCTGATGTGGTCAGGGTTA-3'
((Tm before adding a restriction enzyme site =60℃
((GC before adding a restriction enzyme site =50.0%

GFP
F chain ・・・This has HindⅢ recognition sequence.We added CCC and A to this to prevent flame out.
・5'-CCCAAGCTTAATGCGTAAAGGAGAAGAACT-3'
((Tm before adding a restriction enzyme site =56℃
((GC before adding a restriction enzyme site =40.0%

R chain ・・・This has Pst1 recognition sequence.We added AA to this.
・5'-AACTGCAGTTATTATTTGTATAGTTCATCC-3'
((Tm before adding a restriction enzyme site =54℃
((GC before adding a restriction enzyme site =22.7%



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Figure③:Rough plan



1)We set a heat block(37℃).

2)prepare one microtube.

3)added 1ul restriction enzyme buffer(×10) to microtube

4)added 1ul DNA sample liquid to the microtube

5)added 1ul each restriction enzyme to the microtube

6)added D2W until it became 10ul

7)set microtube to a heat block (37℃)

8)left the microtue more than one hour to push forward a reaction


4:Ligation

1)set the temperature of the heat block.

2)prepared one microtube.

3)added 2ul PCR product (insert DNA) to the microtube.

4)added 1ul Plasmid vector (did with restriction enzyme) to the microtube.

5)added 5ul DNA ligase to the microtube.

6)added 5ul Sterilization water to the microtube and closed the cap

7)set the microtube to heat block.

8)put it for several hours.

9)after 8),saved it in -20℃.


5:Transformation

1)We set a water bus(42℃) and a heat block(37℃).

2)added 280ul LB media to empty microtube and set to heat block.

3)added plasmid(1ul or 2ul) to microtube which has 10ul competent cell.

4)Did tap.

5)left this microtube on ice for 15 minutes.

6)did heat shock with a water bus for 45 seconds.

7)brought it to ice quickly and left on ice for 2 min.

8)added 250ul LB media to this.

9)cultured it at 37 ℃ for one hour

10)applied to LB agar nutrient medium about 20ul arabinose (200 mg/ml) and 20ul ampicillin (100 mg/ml) While I culture it.

11)After 9),we added 125ul Bacteria liquid (we cultured in 9)) to LB agar nutrient medium (we made in 10)).


6:DNA purification

1)From the gel which did electrophoresis, I cut and bring down an objective DNA band.

2)moved the gel which I cut and brought down to microtube.

3)added 500ul buffer QG to the microtube.

4)incubated it for 10min.(50℃)

5)moved liquid of 4) to QIA quick colum.

6)Centrifugal separation(10000rpm, 2 min)

7)discarded the liquid which collected at the bottom of QIA quick colum.

8)Centrifugal separation(10000rpm, 1 min)

9)added 750ul buffer PE to the QIA quick colum and put this about 2 min.

10)Centrifugal separation(10000rpm, 2 min)

11)repeated 9)~10) 2~3 times.

12)discarded the liquid which collected at the bottom of QIA quick colum.

13)Centrifugal separation(10000rpm, 4 min)

14)discarded the liquid which collected at the bottom of QIA quick colum.

15)put the QIA quick colum which disintegrated on the new microtube.

16)added 50ul buffer EB to the QIA quick colum and put about 5 min.

17)Centrifugal separation(10000rpm, 2 min)

18)Objective DNA is in the bottom of the microtube.